GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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For example, I have a lot of images, that I wish to scale them all to the same width , for example, 750px, while height restricted to ratio, no specified height needed.

Any quick way to do it to a large number of images instead of doing them one by one?

The BIMP plugin

http://www.alessandrofrancesconi.it/projects/bimp/

looks like this

Any alternatives to this one? I know this already

Too difficult for you?

Nothing for Gimp with your requirements Batch + fixed width + keep aspect ratio

None Gimp try http://www.faststone.org/FSResizerDetail.htm

If you can handle the command line, then ImageMagick's convert command is for you.

another interesting software (free) is Xnconvert
in addition to resizing you can do a lot of other actions

My preference as well. XnConvert was the first thing I looked at, then thought no good.

While it does have a 'keep-aspect-ratio' tick box and you can set a width and a height, the result depends on whether the image is portrait or landscape.

Started to think about it. Set the height to zero and that will force a 750 pix width regardless of orientation. Seems to work, but who know what OP will do

Dialog looks like this

Rich, tested on Win 10: it works with your setup (force width and preserve ratio)